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beks73 [17]
3 years ago
13

Select the statement below that best describes how environmental conditions affect an individual’s likelihood of survival and re

production.
Explain why you chose the answer you did to the question above.

Chemistry
2 answers:
Tatiana [17]3 years ago
8 0

Answer:

fegknjer

Explanation:

iragen [17]3 years ago
8 0
B - Let’s say for example you put 2 penguins onto Antarctica and then you put 2 giraffes onto the same place. Giraffes have very soft skin and can’t tolerate the cold and basically need warmth to live. They also cannot get their primary food source which are leaves, the environment matters a lot and the penguins would flourish as they would be made for fishing in the ice cold water.
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What is the volume in liters of 48.0g O2? A)11.2L B)22.4L C)33.6L D)67.2
baherus [9]
C. 33.6
Divide mass with density...
6 0
4 years ago
Which describes the relationship between a monomer and a polymer?
Ymorist [56]
A monomer is a single unit. While a polymer is monomers linked together. So your answer would be B.) A collection of monomers combines to form a polymer.
7 0
3 years ago
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Chemical reactions differ from nuclear reactions because ...
ehidna [41]
By eliminating the other incorrect answers, the best answer is (b) <span>chemical reactions involve bonding and nuclear reactions involve releasing particles. Chemical reactions are mainly concerned with bonding between chemicals (though sometimes electrons are released but another atom/ion will absorb it), unlike nuclear reactions which always involves releasing subatomic particles.</span>
6 0
3 years ago
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Suppose you begin with 1.50~g of the hydrate copper(II)sulfate · x-hydrate (CuSO4· x H2O), where x is an integer. After dehydrat
chubhunter [2.5K]

These are two questions and two answers.

Question 1.

Answer: x = 5

Explanation:

1) Data:

m₁ = 1.50 g

compound₁: CuSO₄· x H₂O

m₂ = 0.96g

compound₂ = CuSO₄

x = ? (round to the nearest integer)

2) Solution:

i) molar mass of CuSO₄ = 63.546g/mol + 32.065g/mol + 4×15.999g/mol = 159.607g/mol

ii) number of moles of CuSO₄

number of moles = mass in grams / molar mass = 1.50 g/ 159.607 g/mol = 0.006265 mol

iii) molar mass of H₂O = 18.015 g/mol

iv) mass of H₂O = 1.50g - 0.96g = 0.54g

v) number of moles of H₂O = mass in grams / molar mass = 0.54 g / 18.015 g/mol = 0.0300 mol

vi) Ratio moles H₂O / moles CuSO₄ = 0.0300 / 0.0062625 ≈ 5

∴ x = 5.

Question 2.

Answer: 5.5 g

1) Data:

compound₁ = KAl(SO₄)₂ · 12H₂O.

compound₂ = KAl(SO₄)₂

m₂ = 3.0 g KAl(SO₄)₂

m₁ = ? (two significant figures)

2) Solution:

i) molar mass of KAl(SO₄)₂ = 39.098g/mol + 26.982g/mol + 2×32.065g/mol + 8×15.999g/mol = 258.202

ii) number of moles of KAl(SO₄)₂ = mass in grams / molar mass = 3.0g / 258.202 = 0.011619 mol

iii) number of moles of H₂O = 12 × number of moles of KAl(SO₄)₂ = 12 × 0.011619*12 mol = 0.1394 moles

iv) mass of H₂O = number of moles × molar mass = 0.1394 moles × 18.015 g/mol = 2.5 g (rounded to two significant figures)

v) mass of the original compound = mass of KAl(SO₄)₂ + mass of H₂O = 5.5g

6 0
4 years ago
La capacidad calorífica del aluminio es de 0.9 J/g C. Determine la energía necesaria calentar un bloque de aluminio de 850 g de
Harman [31]

Answer:

La energía necesaria para calentar el bloque de aluminio es 54927 J.

Explanation:

Se denomina calorimetría a la medición y el cálculo de las cantidades de calor que intercambia un cuerpo o un sistema.

De esta manera, entre el calor y la temperatura existe una relación de proporcionalidad directa (Dos magnitudes son directamente proporcionales cuando existe una constante de manera que cuando una de las magnitudes aumenta, la otra también; y lo mismo ocurre cuando alguna de las dos disminuye.). La constante de proporcionalidad depende de la sustancia que constituye el cuerpo como de su masa, y resulta el producto del calor específico por la masa del cuerpo. Entonces, la ecuación que permite calcular intercambios de calor es:

Q=c*m*ΔT

Donde Q es el calor intercambiado por un cuerpo de masa m, constituido por una sustancia de calor específico c y donde ΔT es la variación de temperatura.

En este caso:

  • c= 0.9 \frac{J}{g*C}
  • m= 850 g
  • ΔT= Tfinal - Tinicial= 94.6 C - 22.8 C= 71.8 C

Reemplazando:

Q= 0.9 \frac{J}{g*C}*850 g* 71.8  C

y resolviendo se obtiene:

Q= 54927 J

<u><em>La energía necesaria para calentar el bloque de aluminio es 54927 J.</em></u>

<u><em> </em></u>

<u><em></em></u>

4 0
3 years ago
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